JDK-6291341: jstat: FGC counter confusing when CMS GC is used

Staffan Larsen staffan.larsen at oracle.com
Wed Mar 9 07:13:13 UTC 2016


The jdk changes look good to me. Jon, if you integrate the JVM changes you can do the jdk changes at the same time in the hs-rt repo.

Thanks,
/Staffan


> On 8 mars 2016, at 23:08, Jon Masamitsu <jon.masamitsu at oracle.com> wrote:
> 
> Yasumasa,
> 
> We're discussing this.
> 
> What would the result be if the GC team made the
> JVM changes that you want to contribute.  Meaning,
> without the jdk changes, will jstat continue to work
> as it currently does?  Would the changes in the JVM
> be useful to you without the jstat changes?  By the
> JVM changes, I mean the changes for the counters.
> 
> The reason I ask is that the GC team does not
> own jstat.   If I can integrate the JVM changes
> without the jstat changes, it makes it a little
> simpler.
> 
> Jon
> 
> 
> On 3/8/2016 6:38 AM, Yasumasa Suenaga wrote:
>> Hi all,
>> 
>> I discussed about FullGC counter for Concurrent GC:
>>     http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2016-March/016774.html
>> 
>> I found same issue on JBS:
>>     JDK-6291341: jstat: FGC counter confusing when CMS GC is used
>> 
>> JDK-6291341 was closed with Cannot Reproduce.
>> However, I showed cause of this issue in above thread.
>> 
>> I uploaded patches for this issue:
>> 
>>     hotspot:http://cr.openjdk.java.net/~ysuenaga/JDK-6291341/poc/hotspot/
>>         jdk:http://cr.openjdk.java.net/~ysuenaga/JDK-6291341/poc/jdk/
>> 
>> JDK webrev includes testcase update.
>> All tests for jstat work fine.
>> 
>> 
>> Should I work for it as new issue? Or should I reopen JDK-6291341?
>> 
>> I cannot access JPRT.
>> So I need a sponsor.
>> 
>> 
>> Thanks,
>> 
>> Yasumasa
>> 
>> 
> 



More information about the hotspot-gc-dev mailing list